readers will typically have access to follow-up stories that investigate the accuracy of prior
stories (scoops). So newspapers ex ante face stronger incentives to report in an unbiased
fashion.
To summarize, the simple supply-side model of
Gentzkow et al. (2006) and the model
of
Gentzkow and Shapiro (2006) predict a negative relationship between competition
and the degree of media bias, while
Mullainathan and Shleifer (2005) predict a positive
relationship.
Compared to the empirical literature on demand-driven and supply-led media bias,
there are few econometric contributions about the effects of competition on equilibrium
media bias.
Puglisi and Snyder (2011) find a negative but statistically insignificant effect of
competition on biased coverage of